Hubbard, T.D., Wolken, G.J., Stevens, D.S.P., and Combellick, R.A., 2013, High-resolution lidar data for the Whittier area, Passage Canal, and Portage Lake, Alaska: Alaska Division of Geological & Geophysical Surveys Raw Data File 2013-3, 5 p. https://doi.org/10.14509/24976
Layer Name: metadata
Layer Description: metadata files, read me files and reports
Layer Name: Bare-earth digital terrain models
Layer Description: A model depicting the earth's surface with all vegetation and human-made structures removed
This metadata file was written to document and describe, as a whole, all the lidar data products generated for this project. It provides a brief overview to the data acquisition, processing, and quality control steps utilized by DGGS contractors and subcontractors. Watershed Sciences, Inc. has associated additional metadata (via ArcGIS) with many of the distribution files. The metadata fields populated by WSI are viewable via ArcCatalog and may include additional useful information that is specific to each individual file. However, WSI metadata has not been reviewed by DGGS/DOGAMI to ensure accuracy and completeness. We encourage users to review the delivery and quality control reports provided by Watershed Sciences, Inc. and DOGAMI for a comprehensive discussion of their processes. These reports can be found on the citation page for this publication. The DGGS metadata standard extends the FGDC standard to include elements that are required to facilitate our internal data management. These elements, referred to as "layers," group and describe files that have intrinsic logical or topological relationships. Attribute information for the layers (entity) is included in this metadata file under the "Entity_and_Attribute_Information" section.
The layers are titled:
>Point-cloud data - all returns - classified: Classified (ASPRS standard) lidar attributes for all returns
>Point-cloud data - ground returns - classified: Classified (ASPRS standard) lidar attributes for ground returns
>LAS index file: Vector data which serves as the index illustrating the spatial location of point cloud (LAS) bin delineation
>Raster index: Vector data which displays the project boundary
>Hydro-flattened waterbody polygons: Vector data depicting water bodies (includes lakes, canals and rivers)
>Bare-earth digital terrain models: A model depicting the earth's surface with all vegetation and human-made structures removed
>Highest-hit digital surface models: A model depicting the earth's surface with all vegetation and human-made structures included
>Vegetation digital surface models: A model depicting the above-ground height of the vegetation
>Lidar intensity images: A grayscale image, similar to an orthophoto, which displays 0-255 grayscale values according to the relative reflectivity (based on lidar return intensity) of objects on the ground
>Hillshade images: A grayscale image model created from the bare-earth digital elevation models. It is meant to mimic the hypothetical illumination of the surface according to a specified azimuth and altitude for the sun
Metadata is the data about the data and answers "Who, what, when, where, how and why?" about the dataset. Please see the DGGS Metadata README page for information about our metadata.
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
Alaska Division of Geological & Geophysical Surveys
3354 College Road
Fairbanks, AK 99709-3707
Phone Number: (907)451-5020
Fax Number: (907)451-5050